SAMOP 2023 – scientific programme

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QI: Fachverband Quanteninformation

QI 6: Poster I (joint session QI/Q)

QI 6.26: Poster

Monday, March 6, 2023, 16:30–19:00, Empore Lichthof

Single atoms in optical cavities as source for multiphoton graph states — •Leonardo Ruscio, Philip Thomas, Olivier Morin, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching

Generating multiphoton entangled states is an essential step for the development of quantum information protocols such as measurement based quantum computation. Thanks to their weakly interacting nature, entangled photons are in fact ideal qubit carriers. So far, the most successful source of entangled photons has been spontaneous parametric down conversion, where scaling up is dramatically limited by its intrinsically probabilistic nature. We experimentally demonstrate the feasibility of a single Rubidium atom in an optical cavity as an efficient source of multiphoton graph states [1]. We use the atom as a memory mediating the entanglement generation between the photons and we efficiently grow GHZ states of up to 14 photons and linear cluster states of up to 12 photons. With an overall efficiency of 43%, our experiment opens a way towards scalable measurement-based quantum computation and communication, where this scheme could be for example extended to two atoms in a cavity to generate higher-dimensional cluster states.

[1] P.Thomas et al., Nature 608, 677-681 (2022)